One particularly annoying scenario happens when the app is already running, and a document is opened by double-clicking. The running app correctly tries to open the document, but when it comes time to display it in a window the nib load fails because of failure to find a Value Transformer used in support of bindings for the UI. Does this call to mind any known Cocoa bugs or programming errors that people know of? The program runs fine if the document is dragged onto the Dock icon of the running app or loaded via the File > Open panel.